Fuel System Troubleshooting
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Engine cranks but won't start
- No fuel to carburetor
- Engine flooded with fuel
- No spark at plug (ignition system faulty)
- Clogged air cleaner
- Intake air leak
- Improper choke operation
- Improper throttle operation
Engine idles roughly, runs poorly or stalls
- Improper choke operation
- Ignition malfunction
- Fuel contaminated
- Intake air leak
- Incorrect idle speed
- Incorrect pilot screw adjustment
- Low cylinder compression
- Choke stuck open
- Rich mixture
- Lean mixture
- Clogged carburetor
Misfiring during acceleration
- Ignition system faulty
- Lean mixture
Afterburn during acceleration
- Ignition system faulty
- Lean mixture
Poor performance (driveability) and poor fuel economy
- Fuel system clogged
- Ignition system faulty
- Air cleaner clogged
Afterfiring
- Ignition system malfunction
- Carburetor malfunction
- Lean mixture
- Rich mixture
Lean mixture
- Clogged fuel jets
- Faulty float valve
- Float level too low
- Blocked fuel fill cap air vent hole
- Clogged fuel strainer screen
- Restricted fuel line
- Clogged air vent tube
- Intake air leak
Rich mixture
- Clogged air cleaner
- Worn jet or needle jet
- Faulty float valve
- Float level too high
- Choke stuck open
Incorrect fast idle speed
- Choke stuck open
- Worn piston rings